Strange results from Pagerank and Alexa while comparing top-forums

Domain: Phpbb.com
Pagerank: 5
Alexa: 5.837

Domain: Simplemachines.org
Pagerank: 8
Alexa: 6.697

Domain: Phorum.org
Pagerank: 6
Alexa: 73.008

I was searching for the best free forum-system. After reading some artciles on BBs, wanted to compare the best 3 system. The result confused me very much and I can not still decide. How comes that the best one on Alexa has the worst PageRank on Google?

phpBB has many backlinks from "bad sites" or sites with poor quality.

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